Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Miller I3-PC1 Capacitors
#7

So, I replaced the caps in them as close as possible, yet I have another question.
This is radio I built from the ground up. I even designed the circuit board. I chose to use the generation of 12SA7, 12SK7 and 12SQ7 set.
Is anyone familiar with the impedances these circuit require?
I have an input transformer for the 1st stage and an output transformer for the 2nd stage. The input transformers caps are 107 pF one side and 137 pF on the other. The output transformer caps are 110 pF on one side and 138 on the other.
The question is on each set, which way does the side with the lower value capacitor go? Would the higher impedance go on the side that the output tube plate is connected to and the lower impedance on the grid side (1st stage) or detector side (2nd stage)?

Since a tank circuit balances out to lower capacitor/higher inductance or higher capacitor/lower inductance both balancing out to 455kHz, my gut feeling is that the low capacitor/higher inductance would go with the higher voltage side of the circuit. I just don't yet know enough about IF transformer impedances.


Messages In This Thread
Miller I3-PC1 Capacitors - by Daniel Bingamon - 05-22-2021, 03:17 PM
RE: Miller I3-PC1 Capacitors - by Radioroslyn - 05-22-2021, 04:44 PM
RE: Miller I3-PC1 Capacitors - by Chas - 05-22-2021, 06:14 PM
RE: Miller I3-PC1 Capacitors - by Daniel Bingamon - 05-22-2021, 07:35 PM
RE: Miller I3-PC1 Capacitors - by Chas - 05-22-2021, 08:25 PM
RE: Miller I3-PC1 Capacitors - by Daniel Bingamon - 05-23-2021, 07:34 AM
RE: Miller I3-PC1 Capacitors - by Daniel Bingamon - 06-02-2021, 07:38 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Correct model 84 Ac plug an cord type
From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM
Correct model 84 Ac plug an cord type
Hi Bruce, I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM
Restoring Philco 38-14
OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder. I put a scope on the o...morzh — 08:15 PM
Correct model 84 Ac plug an cord type
Hello Bruce, I mostly use brown far as my cloth powercords go ! Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM
Correct model 84 Ac plug an cord type
Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM
Restoring Philco 38-14
Rod Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM
Restoring Philco 38-14
Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM
Restoring Philco 38-14
hello morzh , That sounds like a plan ! Sincerely Richardradiorich — 07:45 AM
Restoring Philco 38-14
Richard, It helped some, but I still had the whining when engaging the rear power strip (I did not realize it was fro...morzh — 07:07 AM
Restoring Philco 38-14
Hello morzh, Yes , that dreaded hum in my room where i do alighment I have my cable modem and router plus desktop plus ...radiorich — 11:25 PM

[-]
Who's Online
There are currently 3575 online users. [Complete List]
» 1 Member(s) | 3574 Guest(s)
Avatar

>